Storms possible tonight then a soggy seven day outlook

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Outflow from Tuesday morning’s storms pushed sultry, high-dew point air south of the city. Despite the area experiencing its highest temps in 9 months, relatively low humidity kept discomfort levels in check, and helped keep skies clear much of the day.

Conditions are to change Wednesday. Temps are expected to reach, or exceed the 90-degree mark for a third straight day at many area locations. Dew point temps are forecast to surge into the 70s, elevating the heat index to the upper 90s. The moisture rich environment will also provide fuel for t-storm development. By late afternoon, the sultry air mass will become very unstable, leading to explosive storm growth. Damaging wind gusts and large hail are possible.

Storms are forecast to organize into clusters, or waves Wednesday night, bringing the potential for locally excessive rainfall amounts.

Updates at Chicago Weather Center


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